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微处理器监控电路

功能完备的µP监控电路

产品详情

主要特征

应用/用途

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 3.3 to 5.5
Reset Out Active Low
Push-Pull
ICC (µA) (max) 150
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/16
PDIP/16
SOIC (N)/16
Budgetary
Price (See Notes)
5.86
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参量

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 3.3 to 5.5
Reset Out Active Low
Push-Pull
ICC (µA) (max) 150
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/16
PDIP/16
SOIC (N)/16
Budgetary
Price (See Notes)
5.86

主要特征

  • Precision 4.65V Voltage Monitoring
  • 200ms Power-OK/Reset Time Delay
  • Independent Watchdog Timer-Preset or Adjustable
  • 1µA Standby Current
  • Power Switching
    • 250mA Output in VCC Mode
    • 25mA Output in Battery-Backup Mode
  • On-Board Gating of Chip-Enable Signals
    • Memory Write-Cycle Completion
    • 6ns CE Gate Propagation Delay
  • MaxCap™ or SuperCap™ Compatible
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • Backup-Battery Monitor
  • Guaranteed RESET-bar Valid to VCC = 1V

应用/用途

  • 计算机:台式机、工作站和服务器
  • 控制器
  • 精确的µP监控
  • 智能仪表
  • 便携式电池供电设备

描述

The MAX791 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. The 50µA supply current makes the MAX791 ideal for use in portable equipment, while the 6ns chip-enable propagation delay and 250mA output capability (25mA in battery-backup mode) make it suitable for larger, higher-performance equipment.

The MAX791 comes in 16-pin DIP and narrow SO packages and provides the following functions:
  1. µP reset-RESET-bar output is asserted during power-up, power-down, and brownout conditions, and is guaranteed to be in the correct state for VCC down to 1V, even with no battery in the circuit.
  2. Manual-reset input.
  3. A 1.25V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V.
  4. Two-stage power-fail warning-a separate low-line comparator compares VCC to a threshold 150mV above the reset threshold.
  5. Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic.
  6. Software monitoring of backup-battery voltage.
  7. A watchdog-fault output is asserted if the watchdog input has not been toggled within either a preset or an adjustable timeout period.
  8. Write protection of CMOS RAM or EEPROM.
  9. Pulsed watchdog output, to give advance warning of impending WDO-bar assertion caused by watchdog timeout.

简化框图

MAX791:典型工作电路 MAX791:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心